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3 Organization of The Ivana Pavlinac Dodig, M.D., Ph.D. 1 2 1. Brainstem 1. Medulla oblongata 2. Pons 3. Mesencephalon 2. Cranial nerves 3. Cerebellum 3 4 5 Connecting spinal cord to cerebrum and cerebellum. Suprasegmental region of CNS. Medulla oblongata Pons Mesencephalon 6 Grey matter continuity – from spinal cord via brainstem tegmentum to diencephalon White matter continuity – long ascending and descending fibers 7 Physiological roles: Regulation of breathing Regulation of cardiovascular system Regulation of gastro‐intestinal system Regulation of movements Regulation of body balance Regulaation of eyes movements 8 1. Ventral or basal part (basis) = motor pathways 2. Middle part or tegmentum = sensory pathways, reticular formation, cranial nerve nuclei 3. Dorsal part or tectum – only in midbrain; visual and auditory system 9 Long descending motor pathways: Corticospinal Corticobulbar Corticopontine 10 Cranial nerves nuclei Reticular formation Big extrapyramidal motor nuclei (nucl. ruber and substantia nigra) Special monoaminergic tegmental nuclei (nucl. raphe, VTA, locus coeruleus) 11 Sensory: lemniscus medialis, tractus spinothalamicus and trigeminothalamicus Extrapyramidal Non‐specific ascendent pathways (serotoninergic, noradrenergic and cholinergic) 12 50 nuclei Paramedial area – raphe + reticul. nuclei Medial area Lateral area Physiological roles: Modulation of sensory transmission to the cortex Regulation of motor activity Autonomic regulation Sleep and wakefulness cycle Modulation of emotional behaviour 13 14 Reticular nuclei of the pons – excitation of the antigravity muscles Medullary reticular nuclei – inhibition of the antigravity muscles antagonistic action 15 Rostral third = open medulla Caudal 2/3 = closed medulla Dorsal surface of tegmentum = bottom of IV. ventricle Lissauer’s zone = tractus spinalis n. trigemini Pyramids = corticospinal tract; decussation Olives = inferior olivary nucl. Nucl. gracilis and cuneatus 16 Major fiber tracts Internal nuclei 17 Tegmentum = extrapyramidal motor and sensory pathways (lemniscus medialis, tractus spinothalamicus*, spinotectalis, spinoreticularis* and spinocerebellaris) and RF FLM (connecting vestibul. nuclei and lower motor neurons) * lemniscus spinalis 18 Tractus corticospinalis Tractus tectospinalis Tractus rubrospinalis motor Tractus reticulospinalis lat. and med. Fasciculus longitudinalis medialis ▪ Descending part (medial vestibulospinal tract) ▪ Ascending part (from medial, lateral, and superior vestibular nuclei to pons and midbrain; information about head position to cranial nerves) Lemniscus medialis Tractus spinalis n. trigemini – somatosensory information from the head (Neuron II) sensory Tractus spinothalamicus Tractus spinocerebellaris 19 Reticular formation Nucl. gracilis and cuneatus Inferior olivary nuclei (spino‐olivary and rubro‐olivary fibers; to cerebellum) Nucl. spinalis n. trigemini (pain and temperature from head) Cochlear nuclei (n.VIII) Vestibular nuclei (n.VIII) Hypoglossal nucl. (n.XII) Nucl. ambiguus (n.IX & X) Nucl. tractus solitarii (n.IX & X) Dorsal motor vagal nucl. (n.X) 20 1. Level of pyramidal decussation 2. Level of medial lemniscus decussation (+accessory cuneate nucl. –external arcuate fibers – cuneocerebellar tract –inferior cerebellar peduncle: unconscious proprioception from upper limbs) 3. Rostral half of medulla – cranial nerve nuclei 21 General somatic efferent neurons (GSE) Special visceral efferent neurons (SVE) General visceral efferent neurons (GVE) General visceral afferent neurons (GVA) Special visceral afferent neurons (SVA) General sensory afferent neurons (GSA) Special sensory afferent neurons (SSA) 22 GSE – hypoglossal nucl. SVE –nucl. ambiguus (IX, X) GVE – parasympathetic (dorsal motor vagal nucl., nucl. salivatorius inferior) GVA – solitary nucl. (IX, X) – cardiovascular and respiratory reflexes SVA – gustatory portion of the solitary nucl. (taste) GSA –spinal nucl. of trigeminal nerve SSA – vestibular and cochlear nuclei 23 GSE – SVE – GVE – GVA & SVA – GSA – SSA GSE GVE GVA & SVA SSA GSA SVE 24 Lateral medullary syndrome (Wallenberg’s) Contralateral body and ipsilateral face loss of pain and temperature (spinothalamic and spinal trigeminal tract), loss of gag reflex, hoarseness, difficulty with speech and swallowing (nucl. ambiguus) Horner’s syndrome = loss of sympathetic functions Medial medullary syndrome (Dejerine’s) Pyramid, medial lemniscus and root fibers of n. XII Dorsal medullary syndrome Inf. cerebellar peduncle (ataxia), vestibular nuclei (nystagmus, vomiting, vertigo) 25 Basis: fibers nuclei Tegmentum: fibers nuclei 26 Fasciculi longitudinales corticospinal corticobulbar (corticonuclear) interneurons of RF corticopontine Transverse pontine fibers (pontocerebellar) Nuclei pontis (deep) 27 Fibers: fasciculus longitudinalis medialis lemniscus medialis spinothalamic and trigeminothalamic pathways lemniscus lateralis (auditory pathway) extrapyramidal pathways tractus rubrospinalis tractus tectospinalis 28 Nuclei pontis: RF (including raphe nuclei), auditory relay structures: corpus trapeziodeum, superior olivary nucleus (from cochlear nuclei) nucleus locus coerulei, cranial nerves nuclei (V, VI, VII, superior and lateral vestibular nuclei) 29 The locked‐in syndrome large infarct of the basilar pons – corticobulbar and corticospinal tracts communication by blinking and moving eyes 30 Tectum (corpora quadrigemina) Tegmentum Basis (crus cerebri) 31 Colliculi inferiores (auditory relay component; fibers of lemniscus lateralis from cochlear, sup.olivary nucl., and trapeziod body; to CGM – brachium of the inf. colliculus) Colliculi superiores (inputs from retina; projects to cervical spinal cord via tectospinal tract) 32 PAG (enkephalin‐modulation of pain; regulation of autonomic, affective and emotional functions) Cranial nerves nuclei (III,IV+MLF) L&M lemniscus, spinothalamic, trigeminothalamic pathways RF (including raphe – somatomotor, autonomic and visceral regulation) Decussation of the superior cerebellar peduncle Substantia nigra Nucleus ruber (rostral half, motor functions) VTA –dopaminergic mezocortical system 33 Pretectal area (pupillary light reflex) Posterior commissure (pretectal area – coodination of eyes’ movements) Thalamic structures (pulvinar, medial and lateral geniculate nuclei) 34 35 36 Sensory: I. II. VIII. Motor: IV. VI. XI. XII 37 Genereal somatic efferents (GSE): CN III, IV, VI, XII skeletal muscles derived from somites Special visceral efferents (SVE): CN V, VII, IX, X, XI skeletal muscles derived from branchial arches General visceral efferents (GVE = autonomic): CN III, VII, IX, X smooth muscles and glands 38 Precentral gyrus Capsula interna Brainstem (area 4*) Tractus corticobulbaris Neuron I (upper motoneuron) Neuron II Cranial nerves’ (lower nuclei motoneuron) n. III, IV, V, VI, VII, IX, X, XI, XII 39 General somatic afferents (GSA) CN V, VII, IX, X sensations of pain, temp, touch, pressure Special sensory afferents (SSA) CN II, VIII From highly specialized somatic receptors Special visceral afferents (SVA) CN I (olfaction), CN VII, IX, X (taste) – chemoreceptors General visceral afferents (GVA) CN IX and X (visceral pain, chemoreception, general unpleasent feelings) 40 SSA GSA SVA+GVA GSE SVE GVE 41 42 SVA (receptors are chemoreceptors) Enters the brain through the cribriform plate and supplies the olfactory bulb 43 SSA Conveys visual signals to the CNS Enters the brain at the level of the preoptic region of the diencephalon 44 GSE – extraocular eye muscles GVE – parasympathetic inervation of the pupillary and ciliary muscles 45 Motor nucleus: situated in the mesencephalon (level of the superior colliculus) – fossa interpeduncularis – the orbit Superior, medial, and inferior rectus musles, inferior oblique and levator palpebrae superior muscle Bilateral corticobulbar inervation 46 Westphal –Edinger nucleus ¾ Most of the fibers: ciliary ganglion (m. constrictor pupillae*) ¾ Some fibers pass through ciliary ganglion and synapse in episcleral ganglion – ciliary muscle (accomodation) * M. dilatator pupillae –sympathetic fibers from superior cervical gangl. 47 GSE M. obliquus superior – moves eye downward while in medial position 48 SVE (muscles of mastication; upper motoneuron = bilateral inputs from the cortex; lower motoneuron lesions – difficulties in chewing and biting responses) GSA (somatosensory inputs from the anterior 2/3 of the head) 49 GSA from the anterior 2/3 of the head Three principal divisions: Ophtalmic Maxillary Mandibular 50 Neuron I Neuron II Ganglion Trigeminal Skin receptors semilunare Tractus spinalis n.V. nerve Gasseri Ventral trigeminothal.tract Postcentral gyrus VPM of the Internal capsule (area 3,1,2) thalamus Neuron III 51 Neuron I Neuron II Ganglion Main sensory nucl. Of Skin receptors semilunare n.V. (pons) Gasseri Dorsal Ventral trigeminothal. trigeminothal. tract tract Postcentral VPM of the Internal capsule gyrus (area 3,1,2) thalamus Neuron III 52 Muscle spindles in masticatory muscles and temporomandibular joint –via mandibular branch Neuron I = mesencephlic nuceus 53 Trigeminal neuralgia (tic douloureux) Often localized to a portion of one side of the face (associated with a specific branch) Unknown etiology (irritation of the trigeminal nerve by inflammation, tumor, or vascular lesion) Therapy? Surgery? 54 GSE M. rectus lateralis – moves eye laterally Clinical disorder: medial strabismus
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